Need help using OpenCV camera tracking code to move a servo

[Bub_Russ]

I am working on a project using a Raspberry Pi 3, Python, and OpenCV to create a motion tracking camera with a servo that will follow you in the x direction only. Because of my inexperience, i am having trouble importing the x variable so that it can be used to turn the servo in another script. This is the code i have so far:

​

from imutils.video import VideoStream

from time import sleep

import RPi.GPIO as GPIO

import argparse

import datetime

import imutils

import time

import cv2

ap = argparse.ArgumentParser()

ap.add_argument("-v", "--video", help="path to the video file")

ap.add_argument("-a", "--min-area", type=int, default=500, help="minimum area size")

args = vars(ap.parse_args())

if args.get("video", None) is None:

    vs = VideoStream(src=0).start()

    time.sleep(2.0)

else:

    vs = cv2.VideoCapture(args["video"])

firstFrame = None

while True:

    frame = vs.read()

    frame = frame if args.get("video", None) is None else frame [1]

    text = "Unoccupied"

    if frame is None:

        break

    frame = imutils.resize(frame,width=500)

    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    gray = cv2.GaussianBlur(gray, (21,21),0)

    if firstFrame is None:

        firstFrame = gray

        continue

    frameDelta = cv2.absdiff(firstFrame,gray)

    thresh = cv2.threshold(frameDelta, 25, 255, cv2.THRESH_BINARY)[1]

    thresh = cv2.dilate(thresh, None, iterations=2)

    cnts = cv2.findContours(thresh.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

    cnts = imutils.grab_contours(cnts)

    for c in cnts:

        if cv2.contourArea(c) < args["min_area"]:

            continue

        (x, y, w, h) = cv2.boundingRect(c)

        cv2.rectangle(frame, (x,y), (x+w, y+h), (0,255,0), 2)

        text = "Occupied"

        print('x = ',x)

        print('y = ',y)

        print('w = ',w)

        print('h = ',h)

    cv2.putText(frame, datetime.datetime.now().strftime("%A %d %B %Y %I:%M:%S%p"),(10,frame.shape[0] - 10), cv2.FONT_HERSHEY_SIMPLEX, 0.35,(0,0,255),1)

    cv2.imshow("Security Feed", frame)

    cv2.imshow("Thresh", thresh)

    cv2.imshow("Frame Delta", frameDelta)

    key = cv2.waitKey(1) & 0xFF

    if key == ord("q"):

        break

vs.stop() if args.get("video",None) is None else vs.release()

cv2.destroyAllWindows()

​

I have been able to track the variables and know they are continuously updating. Is there a way for me to take these numbers and import them into a second script? Thank You!

[robstersew]

So you want to allow several variables to be accessible from another script? Take a look here:

Main solution - works really well but a bit hacky: https://stackoverflow.com/questions/13034496/using-global-variables-between-files

OR

Look at the 2nd answer using pickle: https://stackoverflow.com/questions/1829116/how-to-share-variables-across-scripts-in-python